Nissan Maxima QX

since 1993 of release

Repair and car operation



Nissan Maxima QX
+ Nissan Maxima brand Cars
+ Maintenance instruction
+ Settings and routine maintenance
- Engine
   + SOHC Engines
   + DOHC Engines
   - General major maintenance of the engine
      General information
      Check of pressure of oil
      Check of kompressionny pressure in cylinders
      Diagnostics of a condition of the engine with use of the vacuum gage
      Alternative versions of schemes of regenerative repair of the engine
      Removal of the power unit from the car - preparation and precautionary measures
      Removal and engine installation
      Order of dismantling of the engine by its preparation for major maintenance
      Dismantling of a head of cylinders
      Cleaning and check of a condition of a head of cylinders
      Service of valves
      Assembly of a head of cylinders
      Removal of shatunno-piston assemblies
      Removal of a cranked shaft
      Cleaning of the block of the engine
      Check of a condition of the block
      Honingovaniye of mirrors of cylinders
      Check of a condition of components of shatunno-piston group
      Check of a condition of a cranked shaft
      Check of a condition and selection of loose leaves of radical and shatunny bearings of a cranked shaft
      Check of a condition of camshafts, pushers of valves and bearings
      Engine assembly order
      Installation of piston rings
      Installation of a cranked shaft and check of working gaps of radical bearings
      Installation of a back epiploon of a cranked shaft
      Installation of shatunno-piston assemblies and check of size of working gaps in shatunny bearings of a cranked shaft
      Trial start and engine running in after major maintenance
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ Control systems of the engine
+ Transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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Check of a condition of camshafts, pushers of valves and bearings

 PERFORMANCE ORDER

1. Check bearing surfaces under installation of camshafts on existence of cavities, scratches, задиров and other signs of excessive wear. In case of detection of defects it is necessary to replace a head.

2. Measure external diameter of each of bearing necks of shaft. Write down results of measurements and compare them to the nominal rates specified in Specifications. Measure internal diameters of bearings in heads of cylinders and subtract from results of the last measurements results corresponding the first. The received difference will make size of gaps in bearings of shaft. Compare the obtained data with requirements of Specifications. In case of need make replacement of shaft and/or heads.

3. Estimate size of radial palpation of shaft, stacking them in V-shaped blocks and using a tsiferblatny measuring instrument of plunzherny type. Rotate a shaft in blocks slowly, write down taken readings and compare them in nominal rates (see. Specifications). In case of need replace the corresponding shaft.

4. By means of a micrometer measure height of cams of shaft. Compare results of measurements to requirements of Specifications, then subtract them from the last for the purpose of definition of degree of wear of cams. If wear exceeds limiting admissible value (see. Specifications), replace the corresponding shaft.

5. Estimate a condition of working surfaces of pushers of valves.

If the contact surface of a pusher is worn-out, it is meaningful to estimate also a condition of a working ledge of the corresponding cam of a distributive shaft / an adjusting washer on DOHC engines.

On SOHC engines pushers should be kept vertically in order to avoid air hit in them (see. Part SOHC Engines of the present Chapter).

6. By means of a micrometer measure external diameter of each pusher. Compare results of measurements to requirements of Specifications. The pushers worn out over an admissible limit replace.

7. Measure diameter of each pusher, compare results of measurements to requirements of Specifications. In case of need replace assembly directing (SOHC engines), or a head of cylinders (DOHC engines).

8. Subtract sizes of external diameters of pushers from sizes of internal diameters of the corresponding nests in directing / to a head for the purpose of definition of a gap of landing of pushers in nests, - at installation of new components (the pushers, directing / the head) is not excluded probability of an exit of this parameter out of limits of admissible values.
9. On SOHC engines estimate degree of wear of yokes and their axes (see. Part SOHC Engines of the present Chapter). At excessive wear of overlays of a yoke are subject to replacement - at all do not undertake attempts of carrying out their regenerative wear.
10. Remember that the condition of all components, - new or suitable for the further use old before installation should be without fail checked.